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When do I Replace a Laser Unit in the Brother HL-5280DW Laser Printer?

The lifespan of the laser unit installed in your Brother HL-5280DW Laser Printer is approx. 100,000 prints. One of the listed messages and print quality problems will appear when the installed laser unit reaches the end of its useful life.

The message [REPLACE LASER] is displayed – Approx. 100,000 pages have been printed since the installation of the laser unit. You should replace the installed laser unit with a new one.

Error codes [E51] and [E52] – The Brother HL-5280DW Laser Printer has detected a laser beam detection error. You should try to solve the problem by turning the laser printer off and then back on. Please replace the installed laser unit with a new one if the same error occurs again.

Black vertical streaks in a gray background; White vertical streaks; Faint print; – You should clean the scanner window, and then test the laser printer. Please replace the installed laser unit if print quality does not improve.

Image distortion – You must make sure that the laser unit is installed properly. Please replace the installed laser unit if the problem persists.

How to Install a Laser Unit in the Brother HL-5280DW Laser Printer

Caution: Please do not try to open the enclosure of the laser unit.

Initially, you must remove the fuser assembly unit from the laser printer (Please refer to ‘’How to Install a Fuser Assembly Unit in the Brother HL-5280DW Laser Printer’’), and then remove the sub duct from the air duct by sliding it to the right. Next, you must carefully remove the used filter from the air duct, and then remove the pin of the air duct from the main frame. After that, you must slide the air duct to the right to remove it, and then remove the six screws that secure the exhausted laser unit to the main frame. Now, you must unplug the two flat cables from the main PCB, and then remove the protective film from the flat cable that connects the laser unit and the polygon motor. In the next step of the replacement procedure, you must unplug the flat cable from the core, and then pull the exhausted laser unit out of the Brother HL-5280DW Laser Printer. Finally, you must install the new laser unit by executing the current procedure in reverse order, and then select [Reset Parts Life Menu] – [LASER UNIT] to reset the counter of the laser unit.